Flexible display panel, method for fabricating the same, and flexible display device

ABSTRACT

The disclosure provides a flexible display panel, a method for fabricating the same, and a flexible display device. A flexible display panel according to an embodiment of the disclosure includes at least one bendable area; a neutral layer adjusting structure arranged in the at least one bendable area, and configured to adjust the position of a neutral layer in the bendable area where the neutral layer adjusting structure is located; and a flexible element located in the bendable area, and configured to be approximately located at the neutral layer.

This application is a National Stage of International Application No.PCT/CN2018/074145, filed Jan. 25, 2018, which claims the benefit ofChinese Patent Application No. 201710301304.5, filed with the ChinesePatent Office on May 2, 2017, and entitled “A flexible display panel, amethod for fabricating the same, and a flexible display device”, both ofwhich are hereby incorporated by reference in their entireties.

FIELD

The present disclosure relates to the field of display technologies, andparticularly to a flexible display panel, a method for fabricating thesame, and a flexible display device.

BACKGROUND

Flexible display panels have become a research focus in the field ofdisplay technologies in recent years, and will bring a profoundinfluence on applications of a wearable device due to a low weight, asmall thickness, bendability, and other characteristics thereof, and theflexible display panels will be widely applied in future as personalintelligent terminals are pervading constantly.

SUMMARY

An embodiment of the disclosure provides a flexible display panelincluding:

at least one bendable area;

a neutral layer adjusting structure arranged in the at least onebendable area, and configured to adjust a position of a neutral layer inthe bendable area where the neutral layer adjusting structure islocated; and

a flexible element located in the bendable area, and configured to beapproximately located at the neutral layer.

Optionally, the bendable area includes a substrate on which the flexibledisplay element is arranged, and the neutral layer adjusting structureis configured to be located on a side of the substrate away from theflexible element.

Optionally, the bendable area includes a substrate on which the flexibledisplay element is arranged, and the neutral layer adjusting structureis configured to be located on a side of the flexible element away fromthe substrate.

Optionally, the neutral layer adjusting structure includes at least twodelimiting strips arranged at an interval on a outermost side of thebendable area where the neutral layer adjusting structure is located, anextension direction of each of the delimiting strips is parallel to adirection of a bending axis of the bendable area, and heights of thedelimiting strips in a direction perpendicular to the flexible displaypanel are same.

Optionally, the neutral layer adjusting structure includes a delimitingblock with a preset thickness arranged on the bendable area where theneutral layer adjusting structure is located.

Optionally, the neutral layer adjusting structure includes at least twodelimiting strips arranged at an interval on a outermost side of thebendable area where the neutral layer adjusting structure is located,and a delimiting block with a preset thickness arranged on the bendablearea where the neutral layer adjusting structure is located; and anextension direction of each of the delimiting strips is parallel to adirection of a bending axis of the bendable area, and heights of thedelimiting strips in a direction perpendicular to the flexible displaypanel are same.

Optionally, the respective delimiting strips are arranged symmetricabout a symmetry axis running through a bending center of the bendablearea where the delimiting strips are located.

Optionally, a spacing between the respective delimiting strips isincreasing gradually from the bending center of the bendable area wherethe delimiting strips are located to two both sides of the bendablearea.

Optionally, the flexible display panel further includes a protectionfilm located on a outermost side of the flexible display panel, and thedelimiting strips are arranged in the protection film.

Optionally, the delimiting strips run through the protection layer in athickness direction of the protection layer.

Optionally, the flexible element is a flexible circuit.

An embodiment of the disclosure further provides a flexible displaydevice including the flexible display panel according to any one of theembodiments above of the disclosure.

An embodiment of the disclosure further provides a method forfabricating a flexible display panel, the method including:

forming a flexible element on a substrate;

forming a protection film on a side of the substrate away from theflexible element; and

forming at least two delimiting strips arranged at an interval on a partof the protection film corresponding to a bendable area, wherein anextension direction of each of the delimiting strips is parallel to adirection of a bending axis of the bendable area where a neutral layeradjusting structure is located, and heights of the delimiting strips ina direction perpendicular to the flexible display panel are same.

An embodiment of the disclosure further provides a method forfabricating a flexible display panel, the method including:

forming a flexible element on a substrate;

forming a protection film on the side of the flexible element away fromthe substrate; and

forming at least two delimiting strips arranged at an interval on a partof the protection film corresponding to a bendable area, wherein anextension direction of each of the delimiting strips is parallel to adirection of a bending axis of the bendable area where a neutral layeradjusting structure is located, and heights of the delimiting strips ina direction perpendicular to the flexible display panel are same.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a first schematic structural diagram of a flexible displaypanel according to an embodiment of the disclosure.

FIG. 2 is a second schematic structural diagram of the flexible displaypanel according to the embodiment of the disclosure.

FIG. 3 is a bottom view of the flexible display panel according to theembodiment of the disclosure.

FIG. 4 is a third schematic structural diagram of the flexible displaypanel according to the embodiment of the disclosure.

FIG. 5 is a fourth schematic structural diagram of the flexible displaypanel according to the embodiment of the disclosure.

FIG. 6 is a fifth schematic structural diagram of the flexible displaypanel according to the embodiment of the disclosure.

FIG. 7 is a sixth schematic structural diagram of the flexible displaypanel according to the embodiment of the disclosure.

FIG. 8 is a schematic structural diagram of a neutral layer made of abendable material.

DETAILED DESCRIPTION OF THE EMBODIMENTS

At present, a flexible display panel is generally bent as follows: adisplay area or a non-display area (e.g., a circuit binding area)thereof is bent; and when the flexible display panel is bent, someelement in the bendable area tends to be damaged, e.g., a circuitcomponent in the circuit binding area in the non-display area of theflexible display panel, a display element in the display area, etc.,thus degrading the product quality of the flexible display panel.

The embodiments of the disclosure provide a flexible display panel, amethod for fabricating the same, and a flexible display device so as toalleviate an element in a bendable area from being damaged when theflexible display panel is bent.

The technical solutions according to the embodiments of the disclosurewill be described below clearly and fully with reference to the drawingsin the embodiments of the disclosure, and apparently the embodiments tobe described are only a part but not all of the embodiments of thedisclosure. Based upon the embodiments here of the disclosure, all theother embodiments which can occur to those ordinarily skilled in the artwithout any inventive effort shall fall into the claimed scope of thedisclosure.

It shall be noted that the thicknesses and shapes of respective layersin the drawings are only intended to illustrate the disclosure of thedisclosure.

An embodiment of the disclosure provides a flexible display panel asillustrated in FIG. 1 including followings.

At least one bendable area 11, a neutral layer adjusting structure 13arranged in the at least one bendable area 11, and configured to adjustthe position of a neutral layer 14′ in the bendable area 11 where theneutral layer adjusting structure is located; and a flexible element 15located in the bendable area 11, and configured to be approximatelylocated at the neutral layer 14′.

Here the concept of the neutral layer is as illustrated in FIG. 8illustrating a bendable material including an outer surface 01, an innersurface 02, and a neutral layer 03, where the bendable material isbendable along a bending axis 04 lying in the direction perpendicular tothe paper; and a component inside the neutral layer 03 is subjected to acompressive stress, and a component outside the neutral layer 03 issubjected to a tensile stress, with respect to the bending axis 04.Accordingly the neutral layer 03 refers to a surface formed of all thepositions with a zero stress when the material is bent and deformed, andthe curvature radius of the neutral layer 03 is defined in Equation (1)below:

$\begin{matrix}{\rho = {{\eta \left( \frac{R + r}{2} \right)} = {\eta \left( \frac{{2r} + h}{2} \right)}}} & (1)\end{matrix}$

Where ρ represents the curvature radius of the neutral layer 03; ηrepresents a thinning coefficient, i.e., the ratio of the bent thicknessto the original thickness; R represents the curvature radius of theouter surface 01; r represents the curvature radius of the inner surface02; and h represents the thickness of the material (i.e., the distancebetween the inner surface 02 and the outer surface 03).

The position of the neutral layer 03 in the material can be changedlocally as the thickness h of the material is changed locally.

Optionally, as illustrated in FIG. 1, in the flexible display panelabove according to the embodiment of the disclosure, the position of theneutral layer in the bendable area 11 where the neutral layer adjustingstructure 13 is located can be adjusted using the neutral layeradjusting structure 13, so that a flexible element 15 in the bendablearea 11 are approximately located at the neutral layer 14′, and thuswill not be easily damaged, thus alleviating the element in the bendablearea from being damaged when the flexible display panel is bent.Optionally, under a real condition, after the position of the neutrallayer is adjusted using the neutral layer adjusting structure 13, theflexible element 15 may not be exactly located at the neutral layer 14′due to an error, but may be located around the neutral layer 14′, thatis, the flexible element 15 may be approximately located at the neutrallayer 14′. For example, the flexible element 15 may be located within anoffset of ±10% and optionally ±5% from the neutral layer 14′, that is,the flexible element 15 is approximately located at the neutral layer14′, and at this time, the flexible element 15 will not be easilydamaged either. Furthermore there may be different layers in differentareas on the flexible display panel, the neutral layer 14′ may not be aplane, but will be illustrated as a layer consisted of several planesfor the sake of convenient understanding.

It shall be noted that for the same flexible display panel, the bendablearea 11 above typically shall be fixed, that is, in the technicalsolution according to the embodiment of the disclosure, the position ofthe neutral layer in the corresponding bendable area 11 can be adjustedusing the neutral layer adjusting structure 13 without changing thedistribution of the bendable area 11 on the flexible display panel.

Optionally, the flexible display panel above according to the embodimentof the disclosure can be a flexible LCD display panel, a flexible OLEDdisplay panel, a flexible electrophoretic display panel, etc. Theflexible display panel as referred to here may be a display panelincluding a flexible display area, or a display panel including aflexible non-display area, or a display panel including both a flexibledisplay area and a flexible non-display area, although the embodiment ofthe disclosure will not be limited thereto.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, referring to FIG. 1, for example, ageneral structure of the flexible display panel can include a substrate12, flexible display elements 121 located in a display area on thesubstrate 12, and/or a flexible circuit located in a non-display area,where an external circuit board is connected with the flexible displayelements 121 through the flexible circuit. Furthermore a circuit bindingarea in the non-display area can include an adhesive material forbinding and adhering, a chip to be bound, a bound component protectingadhesive-material, and other components in addition to the flexiblecircuit.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, referring to FIG. 1, the flexible element15 can be a flexible circuit in the circuit binding area in thenon-display area, for example, but of course, the flexible element 15can alternatively be flexible display elements 121 in the display area,etc., although the embodiment of the disclosure will not be limitedthereto. The flexibility of the flexible element 15 may be lower thanthat of the other components, e.g., the substrate 12, so they may beeasily damaged while the flexible display panel is being bent.

The flexible element 15 which is flexible circuits will be describedthroughout FIG. 1 to FIG. 7. Although only one bendable area 11 isillustrated in FIG. 1 to FIG. 7, and the bendable area 11 is located inthe circuit binding area, the technical solution according to theembodiment of the disclosure will not be limited thereto, and forexample, the bendable area 11 may alternatively be located in thedisplay area, and the number of bendable areas 11 may be plural, asneeded in reality. Furthermore the bendable area 11 may alternatively bethe entire flexible display panel, although the embodiment of thedisclosure will not be limited thereto.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, as illustrated in FIG. 1 to FIG. 7, thebendable area 11 includes a substrate 12 on which the flexible element15 are arranged. FIG. 1 illustrates the position of the neutral layer14′ adjusted using the neutral layer adjusting structure 13, and FIG. 2to FIG. 7 illustrate the position of the neutral layer 14 which is notadjusted.

Optionally, as illustrated in FIG. 2 to FIG. 4, the neutral layeradjusting structure 13 can be located on the same side, of the flexibleelement 15 in the bendable area 11 where the neutral layer adjustingstructure is located, as the neutral layer 14 which is not adjusted. Asillustrated in FIG. 2, for example, the neutral layer adjustingstructure 13, and the neutral layer 14 which is not adjusted can belocated on the side of the flexible element 15 facing the substrate 12of the flexible display panel, and at this time, the neutral layeradjusting structure 13 can be configured to be located on the side ofthe substrate 12 away from the flexible element 15. Optionally, asillustrated in FIG. 5 to FIG. 7, the neutral layer adjusting structure13, and the neutral layer 14 which is not adjusted can alternatively belocated on different sides of the flexible element 15 in the bendablearea 11 where the neutral layer adjusting structure is located. Asillustrated in FIG. 6, for example, the neutral layer 14 which is notadjusted can be located on the side of the flexible element 15 away fromthe substrate 12 of the flexible display panel, and at this time, theneutral layer adjusting structure 13 can be configured to be located onthe side of the substrate 12 away from the flexible element 15; and asillustrated in FIG. 5 and FIG. 7, for example, the neutral layer 14which is not adjusted can be located on the side of the flexible element15 facing the substrate 12 of the flexible display panel, and at thistime, the neutral layer adjusting structure 13 can be configured to belocated on the side of the flexible element 15 away from the substrate12.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, no matter whether the neutral layeradjusting structure 13 is located on the side of the flexible element 15away from the substrate 12, or on the side of the substrate 12 away fromthe flexible element 15, as illustrated in FIG. 2 to FIG. 4, the neutrallayer adjusting structure 13 can include at least two delimiting strips131 arranged at an interval on the outermost side of the bendable area11 where the neutral layer adjusting structure is located, whereextension directions of the respective delimiting strips 131 areparallel to the direction of a bending axis of the bendable area 11, andthe heights of the respective delimiting strips 131 in the directionperpendicular to the flexible display panel are the same.

Optionally, the delimiting strips 131 are arranged so that the thicknessof the bendable area 11 on the neutral layer adjusting structure 13 sideis reduced to thereby enable the adjusted neutral layer 14 to move tothe flexible element 15. Furthermore the delimiting strips 131 arearranged at an interval to reduce the thickness of the bendable area 11so that the flexible display panel can be bent in the bendable area 11.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, no matter whether the neutral layeradjusting structure 13 is located on the side of the flexible element 15away from the substrate 12, or on the side of the substrate 12 away fromthe flexible element 15, as illustrated in FIG. 5, the neutral layeradjusting structure 13 can include a delimiting block 132 with a presetthickness arranged on the bendable area 11 where the neutral layeradjusting structure is located.

Optionally, the delimiting block 132 is arranged so that the thicknessof the bendable area 11 on the neutral layer adjusting structure 13 sideis increased to thereby enable the adjusted neutral layer 14 to move tothe flexible element 15. Furthermore when the delimiting block 132 isarranged to thereby increase the thickness of the bendable area 11, thedelimiting block 132 with a preset thickness in the bendable area 11where the delimiting block is located is such a delimiting block 132that covers at least a part or all of the bendable area 11, that is, thedelimiting block 132 either in a part of or throughout the bendable area11 can achieve the effect of increasing the thickness of the bendablearea 11.

Optionally, the thickness of the delimiting block 132 is related to thedistance between the neutral layer 14, which is not adjusted, in thebendable area 11 where the delimiting block is located, and the flexibleelement 15, so the preset thickness of the delimiting block 132 abovecan be set as needed in reality.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, no matter whether the neutral layeradjusting structure 13 is located on the side of the flexible element 15away from the substrate 12, or on the side of the substrate 12 away fromthe flexible element 15, as illustrated in FIG. 6 and FIG. 7, theneutral layer adjusting structure 13 can include at least two delimitingstrips 131 arranged at an interval on the outermost side of the bendablearea 11 where the neutral layer adjusting structure is located, and adelimiting block 132 with a preset thickness arranged on the bendablearea 11 where the neutral layer adjusting structure is located, wherethe extension directions of the respective delimiting strips 131 areparallel to the direction of a bending axis of the bendable area 11, andthe heights of the respective delimiting strips 131 in the directionperpendicular to the flexible display panel are the same.

As illustrated in FIG. 6, if the neutral layer 14 which is not adjustedis located on the side of the flexible element 15 away from thesubstrate 12 of the flexible display panel, then the neutral layeradjusting structure 13 will be located on the side of the substrate 12away from the flexible element 15, the delimiting strips 131 will belocated on the outermost side of the flexible display panel, and on theside of the substrate 12 away from the flexible element 15, and thedelimiting block 132 will be located between the substrate 12 and thedelimiting strips 131.

As illustrated in FIG. 7, if the neutral layer 14 which is not adjustedis located on the side of the flexible element 15 facing the substrate12 of the flexible display panel, then the neutral layer adjustingstructure 13 will be located on the side of the flexible element 15 awayfrom the substrate 12, the delimiting strips 131 will be located on theoutermost side of the flexible display panel, and on the side of theflexible element 15 away from the substrate 12, and the delimiting block132 will be located between the flexible element 15 and the delimitingstrips 131.

Optionally, the delimiting block 132 can be arranged so that theadjusted neutral layer 14 is positioned on the same side, of theflexible element 15 in the bendable area 11 where the delimiting blockis located, as that of the delimiting block, and then the delimitingstrips 131 can be arranged so that the flexible element 15 in thebendable area 11 is located at the neutral layer 14. Furthermore thedelimiting strips 131 can be arranged on the outermost side to therebyenable the flexible display panel to be bent.

It shall be noted that in order not to affect a display effect, when thebendable area 11 is located in the display area, typically the positionof the neutral layer 14 is typically adjusted using the neutral layeradjusting structure 13 including the delimiting strips 131 located onanother side than a display face.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, the respective delimiting strips 131 canbe arranged at an uniform interval, or can be arranged at a non-uniforminterval, although the embodiment of the disclosure will not be limitedthereto.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, the heights of the delimiting strips 131are related to the distance between the neutral layer 14, which is notadjusted, in the bendable area, and the flexible element 15, so thepreset heights of the delimiting strips 131 can be set as needed inreality.

It shall be noted that if there are a larger number of delimiting strips131 in the bendable area 11 where the delimiting strips are located,that is, the delimiting strips 131 are distributed at a higher density,then they will be less bendable, that is, they will have a largerbending curvature; and if there are a smaller number of delimitingstrips 131 in the bendable area 11 where the delimiting strips arelocated, that is, the delimiting strips 131 are distributed at a lowerdensity, then they will be more bendable, that is, they will have asmaller bending curvature, so the number of delimiting strips 131 can beset according to a desirable bending radius.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, as illustrated in FIG. 2 to FIG. 7, inorder to enable the flexible display panel to be bent, the respectivedelimiting strips 131 can be arranged symmetric about a symmetry axisrunning through the bending center 111 of the bendable area 11 where thedelimiting strips are located, and distributed in an array in thebending direction of the bendable area 11 where the delimiting stripsare located.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, as illustrated in FIG. 2 to FIG. 7, thespacing between the respective delimiting strips 131 may be increasinggradually from the bending direction of the bendable area 11 where thedelimiting strips are located, and the spacing between the differentdelimiting strips 131 can accommodate different extents of bending, sothat the flexible display panel can be bent for adjusting while it isbeing subsequently assembled.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, the sidewalls of the delimiting strips 131can be planar or arced surfaces. The arced surfaces may be convex orconcave, and the sidewalls of the delimiting strips 131 can beperpendicular to the substrate of the flexible display panel, or can bearranged at an angle from the substrate of the flexible display panel,although the embodiment of the disclosure will not be limited thereto.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, as illustrated in FIG. 2 to FIG. 4 andFIG. 6, the flexible display panel can further include a protection film16 located on the outermost side of the flexible display panel, and thedelimiting strips 131 can be arranged in the protection film 16. FIG. 2to FIG. 7 illustrate the protection layer 16 arranged on the backside ofthe flexible display panel, i.e., another side thereof than the displayface, but the protection layer 16 can alternatively be located on thedisplay face in reality, although the embodiment of the disclosure willnot be limited thereto.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, as illustrated in FIG. 2 to FIG. 7, theprotection layer 16 can include a back-film substrate 161 and aback-film adhesive layer 162, where the material of the back-filmsubstrate 161 can be polyimide (PI), a metal foil, triacetate cellulose(TAC), polycarbonate (PC), Polyethylene naphthalate two formic acidglycol ester (PEN), Polyethylene terephthalate two formic acid glycolester (PET), etc.

Optionally, since the protection film 16 is arranged at the same layeras the delimiting layers 131, they can be fabricated in a process tothereby simplify the process.

Optionally, in the flexible display panel above according to theembodiment of the disclosure, as illustrated in FIG. 4, the delimitingstrips 131 can run through the protection layer 16 in the thicknessdirection thereof, that is, the delimiting strips 131 run through theback-film substrate 161 and the back-film adhesive layer 162 in thethickness direction of the protection layer 16. Of course, the heightsof the delimiting strips 131 can alternatively be less than thethickness of the protection film 16, and as illustrated in FIG. 2, FIG.3, and FIG. 6, for example, the heights of the delimiting strips 131 canalternatively be less than or equal to the thickness of the back-filmsubstrate 161, that is, the back-film adhesive layer 162 is not runthrough by the delimiting strips 131. The thicknesses of the delimitingstrips 131 can be optionally determined by the distance between theneutral layer 14 and the flexible element 15 to be adjusted as needed inreality.

In an embodiment of the disclosure, the flexible display panel which isa top-emitting flexible display panel includes two bendable areas 11including one located in the circuit binding area, and the other locatedin the display area, in both of which, the neutral layer 14 which is notadjusted is located on the located on the sides of the respectiveflexible elements 15 facing the substrate 12 of the flexible displaypanel; and the protection film 16 is arranged on the backside of theflexible display panel, and located on the outermost side of theflexible display panel, and at this time, the respective delimitingstrips 131 can be arranged in the protection film 16 at positionscorresponding to these two bendable areas 11, and the thicknesses of thedelimiting strips 131 are set according to distance between the neutrallayer 14 and the flexible elements 15 to be adjusted as needed inreality.

Based upon the inventive idea above, those skilled in the art canappreciate that when there are a plurality of bendable areas 11, thearrangement of the neutral layer adjusting structure 13 in therespective bendable areas 11 can be adjusted as needed for theperformance of the different bendable areas 11, and the flexibilities ofthe elements therein. When a bendable area 11 involves a plurality offlexible elements, or runs across the display area and the non-displayarea of the flexible display panel, the spacing between the delimitingstrips 131, and their heights can be finely adjusted for the differentflexible elements or areas as needed.

Based upon the inventive idea above, those skilled in the art canappreciate that since the delimiting block 132 and the delimiting strips131 play different roles in the neutral layer adjusting structure 13,they generally operate as illustrated in FIG. 6 or FIG. 7. Since cuttinginto the delimiting strips 131 is process-restrained, if it is necessaryto perform a fine adjustment which cannot be achieved by adjusting thedelimiting strips 131 separately, then the delimiting block 132 and thedelimiting strips 131 may be arranged on the same side of the flexibleelement 15 for adjusting.

Based upon the same inventive idea, an embodiment of the disclosurefurther provides a method for fabricating a flexible display panel,where the method includes the following steps.

The step of forming a flexible element on a substrate.

The step of forming a protection film on the side of the substrate awayfrom the flexible element.

The step of forming at least two delimiting strips arranged at aninterval on the part of the protection film corresponding to a bendablearea, where the extension directions of the respective delimiting stripsare parallel to the direction of a bending axis of the bendable areawhere a neutral layer adjusting structure is located, and the heights ofthe respective delimiting strips in the direction perpendicular to theflexible display panel are the same.

Optionally, at least two delimiting strips are formed at an interval inthe part of the protection film corresponding to the bendable area, andthe delimiting strips can be formed through laser cutting, die cutting,knife-wheel cutting, etching, or in another process.

Based upon the same inventive idea, an embodiment of the disclosurefurther provides another method for fabricating a flexible displaypanel, where the method includes the following steps.

The step of forming a flexible element on a substrate.

The step of forming a protection film on the side of the flexibleelement away from the substrate.

The step of forming at least two delimiting strips arranged at aninterval on the part of the protection film corresponding to a bendablearea, where the extension directions of the respective delimiting stripsare parallel to the direction of a bending axis of the bendable areawhere a neutral layer adjusting structure is located, and the heights ofthe respective delimiting strips in the direction perpendicular to theflexible display panel are the same.

Optionally, at least two delimiting strips are formed at an interval inthe part of the protection film corresponding to the bendable area, andthe delimiting strips can be formed through laser cutting, die cutting,knife-wheel cutting, etching, or in another process.

Based upon the same inventive idea, an embodiment of the disclosurefurther provides a flexible display device including the flexibledisplay panel according to any one of the embodiments above of thedisclosure. For example, the flexible display device can be a flexibleLCD display, a flexible OLED display, a flexible electrophoreticdisplay, although the embodiment of the disclosure will not be limitedthereto.

In summary, in the technical solutions according to the embodiments ofthe disclosure, the flexible display panel includes at least onebendable area, a neutral layer adjusting structure arranged in the atleast one bendable area, and configured to adjust the position of aneutral layer in the bendable area where the neutral layer adjustingstructure is located; and a flexible element located in the bendablearea, and configured to be approximately located at the neutral layer.Since the neutral layer adjusting structure is arranged on the flexibledisplay panel at the position corresponding to the at least one bendablearea of the flexible display panel, the position of the neutral layer inthe bendable area where the neutral layer adjusting structure is locatedcan be adjusted using the neutral layer adjusting structure, so that theflexible element in the bendable area can be approximately located atthe neutral layer, and thus will not be easily damaged, thus alleviatingthe flexible element in the bendable area from being damaged when theflexible display panel is bent.

Evidently those skilled in the art can make various modifications andvariations to the disclosure without departing from the spirit and scopeof the disclosure. Thus the disclosure is also intended to encompassthese modifications and variations thereto so long as the modificationsand variations come into the scope of the claims appended to thedisclosure and their equivalents.

1. A flexible display panel, comprising: at least one bendable area; aneutral layer adjusting structure arranged in the at least one bendablearea, and configured to adjust a position of a neutral layer in thebendable area where the neutral layer adjusting structure is located;and a flexible element located in the bendable area, and configured tobe approximately located at the neutral layer.
 2. The flexible displaypanel according to claim 1, wherein the bendable area comprises asubstrate on which the flexible display element is arranged, and theneutral layer adjusting structure is configured to be located on a sideof the substrate away from the flexible element.
 3. The flexible displaypanel according to claim 1, wherein the bendable area comprises asubstrate on which the flexible display element is arranged, and theneutral layer adjusting structure is configured to be located on theside of the flexible element away from the substrate.
 4. The flexibledisplay panel according to claim 2, wherein the neutral layer adjustingstructure comprises at least two delimiting strips arranged at aninterval on a outermost side of the bendable area where the neutrallayer adjusting structure is located, an extension direction of each ofthe delimiting strips is parallel to a direction of a bending axis ofthe bendable area, and heights of the respective delimiting strips in adirection perpendicular to the flexible display panel is same.
 5. Theflexible display panel according to claim 2, wherein the neutral layeradjusting structure comprises a delimiting block with a preset thicknessarranged on the bendable area where the neutral layer adjustingstructure is located.
 6. The flexible display panel according to claim2, wherein the neutral layer adjusting structure comprises at least twodelimiting strips arranged at an interval on a outermost side of thebendable area where the neutral layer adjusting structure is located,and a delimiting block with a preset thickness arranged on the bendablearea where the neutral layer adjusting structure is located; and anextension direction of each of the delimiting strips is parallel to adirection of a bending axis of the bendable area, and heights of thedelimiting strips in a direction perpendicular to the flexible displaypanel are same.
 7. The flexible display panel according to claim 4,wherein the delimiting strips are arranged symmetric about a symmetryaxis running through a bending center of the bendable area where thedelimiting strips are located.
 8. The flexible display panel accordingto claim 7, wherein a spacing between each of the delimiting strips isincreasing gradually from the bending center of the bendable area wherethe delimiting strips are located to both sides of the bendable area. 9.The flexible display panel according to claim 4, further comprises aprotection film located on a outermost side of the flexible displaypanel, and the delimiting strips are arranged in the protection film.10. The flexible display panel according to claim 9, wherein thedelimiting strips run through the protection layer in a thicknessdirection of the protection layer.
 11. The flexible display panelaccording to claim 1, wherein the flexible element is a flexiblecircuit.
 12. A flexible display device, comprising the flexible displaypanel according to claim
 1. 13. A method for fabricating a flexibledisplay panel, the method comprising: forming a flexible element on asubstrate; forming a protection film on a side of the substrate awayfrom the flexible element; and forming at least two delimiting stripsarranged at an interval on a part of the protection film correspondingto a bendable area, wherein an extension direction of each of thedelimiting strips is parallel to a direction of a bending axis of thebendable area where a neutral layer adjusting structure is located, andheights of the delimiting strips in a direction perpendicular to theflexible display panel are same.
 14. A method for fabricating a flexibledisplay panel, the method comprising: forming a flexible element on asubstrate; forming a protection film on a side of the flexible elementaway from the substrate; and forming at least two delimiting stripsarranged at an interval on a part of the protection film correspondingto a bendable area, wherein an extension direction of each of thedelimiting strips is parallel to a direction of a bending axis of thebendable area where a neutral layer adjusting structure is located, andheights of the delimiting strips in a direction perpendicular to theflexible display panel are same.